Fixing loss device handling #62
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Moving loss device to gpu if necessary, might also improve performance compared to x.cpu(), y.cpu(): https://discuss.pytorch.org/t/what-does-it-mean-to-move-a-loss-function-to-device-gpu/52832
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Training on cuda is broken at the moment, because the loss function does not get moved to cuda (or x and y do not get moved to cpu).
Moving loss device to gpu if necessary, might also improve performance compared to x.cpu(), y.cpu(): https://discuss.pytorch.org/t/what-does-it-mean-to-move-a-loss-function-to-device-gpu/52832